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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa25305d07f2b4547cf6744e3e8633d308fff02c0a95378fd683d540236cfdb8' 
  AND token = '1NbD8X1OsTCwvOftM0EcpzYnkR+BwYx9rqltGL5sh+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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