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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8322a08ed74131a0df6888c033900fc76a21db3be73b531fe0f558cf794ba29' 
  AND token = 'ZXRXpeMOPwuSm86qyhw8QXr/pwOm4jofx6I7xr12080=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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