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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cebd231ae5ae2cc4f5a61ab372a5cb80df81977762657ef7eb92551d624629' 
  AND token = '5C8FKnAhcw2l5ugMwiutZHoMjuvxT0mLA+2uElL867E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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