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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df39cfe2dca1746662824ab626434ad18b694081adc70d1573adac973c745ae2' 
  AND token = 'HtvPryxq2sbQ4fH6oO7vzuo6o/LnwMSjNbwQXP5Fh9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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