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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99407ab8ba71557de10e20c2b81fa12efe0d124f5fdce8bba62581d0d41daea4' 
  AND token = 'z9TzwQeJR5snxdvVpiAUP6Sv595L7Yd5v6Jk1wYp6KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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