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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6df732de17d46fbe04a87f2afe7e12471cce181d86fbc0b1fae10fdf6fce751' 
  AND token = 'VOLZX3mdGP7B0cpdMammhA191ZkbzKz/RfvxxA8FqKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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