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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b27f7418c561f6604f807a094cd7f7f83b7138aa732a86cad28dbbeee4082b2d' 
  AND token = 'aalkEwUbravKO5XI/0rSzmpK0O4Ffd/2NbarKwILjQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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