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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0de39a57a4d970a9d3d4a75eefad1b3da03921d8b27c616621558b5c427735e' 
  AND token = 'aDrjyQxfEgHbHthA3OHhAnDN++xB91Xuo+BxDB10Gbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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