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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ff9e804e0d5500ad1e54341ff3eb1d9e258b1ec55025e0152bc9b8003b7443' 
  AND token = 'N7kJvRprnnfjDgg0UG3rNetgN5H8/uaeVYOzw4n95JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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