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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '714e61665c4aec7bcc74f1ac13dfcbbbdc0b320c22143c8cada8b3c7275c0eea' 
  AND token = 's8riG8xj6Q5zb1R1yM8SSeDs2YwJkhEbUcZcHV2s5no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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