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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e0444d71f07815fec5ce045e8b64db8683ac7720d1f54c63385a15fdec312f' 
  AND token = '/dxa9ZomyVcjKn4UoWr00wkWrG5qOmsY3rnYIbypc/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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