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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65df697613733110decf6b7976f45c1faee10ff00fead7e9efe228c4dadc2f07' 
  AND token = 'tSMo91sK9Rlebecx6fFxUynxwbSFkt2GJvDz6g4lTf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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