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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49db005e9eea622261e5068011fcd0d848191e4b2c68778d66e76cea1d24a62f' 
  AND token = 'qjkadAY4kkUye1J1g3bOi3YaczJu5cITbI94I2tSvUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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