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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37cbc92b3650513e054fa9a048ecfa32d7c934be3eb8df3a49582cca6502de98' 
  AND token = 'eGj8rvUERcf4BBznMQxiGVa7n47saio182Gmj0uluVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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