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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343b131c2e67f24b1c46d7ff214f292bbe7ba8feb1a3922918fe88ac718d032a' 
  AND token = 'd7NK6ImACXzCUrxrkqDeqJJ2ccNVW78vuwG0hQiIaRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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