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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e55c230139fcb6343884d819671ac40e100ae018d9375b0ed3690e41a58924' 
  AND token = 'kx+iABZc4xh+NHmvSXyc0KHFKPJjmpOb+Lmg7rtv5aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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