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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0658d1311d867f060bb1de4eb589bfe4e7358673576889013ac57c2e091f67a4' 
  AND token = 'Am0o6mfHWlCbfdRqIZb0n4m0Uk1biayJbLC8dVbJMr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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