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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ed2345f792bd96107a743ef513fa694a7cdd8c1068fa63391a6270a783fb4e' 
  AND token = 'LSQaCWKo0O2ufJpnniUsqqJMKvCi821e+vFxTMda1Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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