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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5f0a8b9e40a55ce428e2c762cdffde969e3a03356d0a274a0ef15d0e5b29bd' 
  AND token = 'B6ZrSli4s378qlnhuK/7LUfS0Xc78MnnSYcGX/JEg9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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