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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c7e7af0d478faa2a0515a876c68f824a0591adee03db18a9e757201a82cc23' 
  AND token = 'B7veEGs/qy8pOsP/UfQsowhLsiAnD873L10dQOd/f5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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