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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e5b0b4cde28eea1b731477fd7e75fcafe6c3bc793233bdfb098760bb799bae' 
  AND token = '0LWTOio5yK9ehvpb4Uit352ppp4mXr/mEpJz9rNQ46I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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