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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583f4f07cd7d5ff072893d105d3cd715c367042dfb6ea50e992f0e75d4f07482' 
  AND token = 'sQr2MJra6epoua+0q/5KrT1d4rqSBumCveowZPDLkw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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