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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f90da40bc0bf83ee50a0a430b6c7c9a970d36bff66cdd9974980013cb0c84ea' 
  AND token = 'dph0q4lf+zMjE6Va70kdSJnncGHuk20Yt7Nqn1gy0CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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