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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4c6efe5a2af77e48347fea10f289709d9dda35519a76f0e3a3e67430c0206f' 
  AND token = '9JLVcIrUAsh3y2nxHtHuaMsJ4Ff3O5Ejm6KlvzGtKJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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