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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80854a554a9d1d5ca9b7f646cec8890895c3a0d6c84bb92f8618c1f301d4ad57' 
  AND token = '7uMRKtMlkX8aaIeBGKc0/httx3URBKRJRP/wN4MHTbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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