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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559d39244b93b3aab58ce4928359a5361bd7befd25a8ffe4aa2a4a2c35b97d19' 
  AND token = 'dFJK1tq2fy1CYxoVyMWBVMzFTiaHlsVH94KwOsl3DE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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