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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d4310deadb380fdd95f9106bd211c559e2e78f6857a52f8fdac0b7603c20c3' 
  AND token = 'RCOjylnt0pEUUAUfbMddT4Rb2IbPGMWRcTRufNvIgfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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