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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415a905e80f37faf059003cec2132c4ded0b0c062d2f51159d34ca89c60b702f' 
  AND token = 'yQxc3T1afFcpacKb42EjTwlhFkJOWupZKCzQ2nSBN6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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