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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0fa6fd7a66877ec2055b84a065c227a34b5e14888c2fc94d9cab9ae4d91de1' 
  AND token = 'fl7ocDeN7q+BShwsQITLqTOtHYtnomWDnsRKX/BQQ6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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