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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '549888ccb579b1ba1e9cfd07ab4fbc0e042a782fbe3f49accfa251a1abb7f3fb' 
  AND token = '+Tz0No5hxmXWStBBZDy2/PLQSns9hqFM35rZLxLZHkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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