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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deea0b3cbe383d004eae74844c90735de7f6f695ca5c9b5dce8db7a479535af0' 
  AND token = 'I3l63eCEXD0mUXpVlmZwx1MnLYkoeAOcWiYA00FVRLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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