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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7b5bdd9ce93f0d0725357158597ac9bb3a4d3ac179cafdbfe3b8ab8ab3046f2' 
  AND token = 'bVjMpcAMOp/RvhgPpThFcX16A8BWW9bG6GfIxaFh60M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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