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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da39bb28a8cfe394e3dd8bb9a07669c5dd6e2515bfca3f4e8a4d40462545cf1' 
  AND token = 'dZuOWqrE3o6qo1q5DEFvPH/oLMobiZHP8UlRiTVX8Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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