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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad707dd60c0812d87f5952fd3ccb3e0d9ce43900068be2ed130d15116a3d2bcc' 
  AND token = 'SrgwarbyoZPMiHG7vY5kigyIob7LF67H73mc29wEW78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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