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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72b4d45c6c30dcb7ad6278651d598e0235060be61ca94134b463d5d339f5bbe6' 
  AND token = 'f+u9IT4utdVXinbOOYXLEQDTLX+pWhGqxRxDwzqlLrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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