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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40d79f807a6e6f77558570c371120f02f9a038f19a2793cdbd238faad258f60' 
  AND token = 'AqF1pnaWB7o75gHcXjrcwI6eodnyar+kXaRnQdAlvmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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