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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5a1ae4d5b14cf2694512df8b928a8bc4dd2caed5eb20e4f4408ee6d10bd72c' 
  AND token = '8TuWJYjw8FHGipnoKIW482rwKkB1iVeZgYSV92Vle1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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