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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6357ea662c46f85eebb4adc3b2829d4367af44c2fd8ca0c17e20065b40e299' 
  AND token = 'H3R24CGwIshwejyh+R34Mc0bljnmIDFCwvaVyoEgugg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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