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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13bc4333fc4296f70200ad0fab72478f03c1d0338d16d618c46e5d5c2b76f0de' 
  AND token = 'jLDOmL2K1zthnwjsdl1Wtkp4KVvpVcEuFKlwp06c1To=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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