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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f56dd1281744e76ee15d4e7e6b5ae5ac4af0b3b73bd4c36911fe0f569897c66' 
  AND token = 'kXv2/pdPREaSk/JAFBonnAkA42jrk4yqiA52aa3R7IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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