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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd439d25a64196b3dee750d7ea9ffb5f310e0d026f631c90b3ea843f576545a55' 
  AND token = 'a9HyzlsBl7fbjkyfCQiKHAz+j/chApKKlYc28FCi0iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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