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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f2503bb871ccb0f0701d8227dfb435316bdbb5972b01f4ee5a28dab70b7a04' 
  AND token = 'BBLR84U+Q54aB0W70768BVXENQ3T7mre3WhznLKYcZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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