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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7492dae51adde9e6d578684792efc2b0b3e134e455b6b4190e7d811696e71a4f' 
  AND token = 'K/eqeuv2QAIF5+fzTT/y8xOR28qPR/Ta8zSkLLKTZA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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