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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f44614519821a8d937ea8296ee7b0dc117ba9f3449e21a428d6ce590bfa46e7' 
  AND token = 'Y3mT1t+0ZXuDK2xZhaueI2+Pbjiil0c494xpdM/vB+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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