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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f0ddf40f2759357570b9029ef5e2799405e8abd01b1b14da61720b356c29a6b' 
  AND token = 'yeyMAfxSO1bMhln+Ld/a5KQkGKEIf58YpMYghQjQMPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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