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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bebf1e0b3a8510bc422070fd8072d1333023b54c01d84986db914231e3944c21' 
  AND token = 'trkwos3FiqqSJDtju6ga5+eYCvLXnwajauidCtxML04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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