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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd30f7c5004334cdb48c49d693be536c77e2437e6aac3553e8359e59624891f7' 
  AND token = 'YMtj0hi7/EuyGbraIQ+OWHxewHWTCpasGhx1Obi/hzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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