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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0df778e91fe896d1fe0aa8c9d9aba7549e15ea1642c106667577ca5abcab1fa' 
  AND token = 'GSNnD94fuHtKnFMrczVUABLo35cWB5hCg/o/C9ArnpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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