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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bbd7ebd15719f32424f29b753da610f1538b983c4b1ee22a8f24fc96d32a93' 
  AND token = 'Cn+F5QZfAOzQaZ/6s/na3/XOS+OjrOgA7rqL12LFHag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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