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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50200f54414d6e427b539113400f5941e98c34c2eb41aec7fb38a6b6b36e62d2' 
  AND token = 'rAm6+vHD+ajNM9lS00AZeMQVJpIWeTZy15ueMUAheJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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