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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde76544c9868f7ebe958a57ed2cb8e95675eed4305e2fda382925202d67a0de' 
  AND token = 'vsDDjwoY1S7RKsfK3vG6oBk+HyzKACdmte2KOkFIY0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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