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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040bd3863abf8645c7f7291e0930d4e32179f6f6c1a28ef23b0b1576cdfbb8ea' 
  AND token = 'P0Vw47N2kRjiamTYb40L78YvodOw5CQmih975WanfgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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