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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8a8571fe44ca348d8e1f6aac281a1b0745083a8008687a67127bbb6e2022d0' 
  AND token = 'XqsGv8wlUceZCeurONHJ6E8ELhJ8S+/g6Ek62Djib+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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