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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d0b8e93e5ccceb8619a704e30f9b475765f79623953f8e65b177e7f1d3a5d5' 
  AND token = 'QWkZvFnh7OLsb2nsTb1PjUjM32vS0IzaNIk1M81lIUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}