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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a789b0d5d98329138703ffe491f177583706e1495b4c273fa1e9782107feecb' 
  AND token = 'EnCZI5PpZEx9e5RS/5jMm2VnKx2XfliwOq4sJWBlhf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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